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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b128f4018ab58be91b94d68cb781227d55393ec54c5641e7a1133d8689069268' 
  AND token = 'ZC3KR/zPKh5uhaekQWmx8if7RAdzUPtkqRW6naE2Jqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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