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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042c0704b9b40d6863b67b351ed6e03d95bac0510b380d44d23f0c42e49dc796' 
  AND token = 'HfQXjSmo1yyoCR6NSrc7G1K6K1Zgn82p6B8liwZVZoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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