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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5272352194e48f5ef0d6d3ad47ea7e0e5b0f1d18a8513e25d4a2b6d7bb257ce' 
  AND token = 'jByvVOVj0uwNmb9rP0JtxTA5yc/H4RHjeBa62Xc/fvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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