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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5394c41a69ff0d0e8d27d6d96e84239b395372f650397b0760495a7f6774c079' 
  AND token = 'c6Rpqx8S1O+N8uXfguWowp88XjQgEfL/2nRIVi+jiXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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