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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76468094455e60c394004979eae0b9eef2839cbb07625d99bbe2f9b377f37d31' 
  AND token = 'L8RGHr3T/8mXB5bncklykaHEj1uqGlK4dBXhW/1fy2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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