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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b20436d65e11f39d7cfcab4bb975ec3a89c5dd5490a5e9bffb8aa356e598da' 
  AND token = '1rokOD4jW16qi2ijxkK1aNr3N/8xq3jXG1XvBw21rH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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