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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fef962fef1747d8a9c44290557a289a72a087ecec87e2b49e7b112899b3883' 
  AND token = '5mEX8dtD8p/Inj8plWTPlvvBVhA0lemoR8O6+kciQyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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