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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0442790b6e9699e3f3474f0fdefe0098b3fc2c1808a7a455ba93ddb9d73822ed' 
  AND token = 'KVGwt8kX7aTku5raRLztt1BvrQFfIHXzfo5rSTELFso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}