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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e58730ccc5512406f771b685d87aa92ca6f9ca3d68990e5f116b7e91ae8625' 
  AND token = '/oxO2JibN329JaI/GJMW6mjq54+PGaW5jOxvRa2rWvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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