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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03e2e8856b8db694c0a6c619eddcdf738f9d9c11ef68685b354f771930b6ad8' 
  AND token = '2cG4tvR0w+4UOqgOPv1wRtGgkagVH7Rq9h7tqHyq1ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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