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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc2e9dfa58b0fbef2341ce014f035ca1fecdb930d59d0f03c2ee28501bba7d3' 
  AND token = 'b8MUdxA6CJ9aTd6RWD8PxpV7NGHrsVU9MIsRfhQopzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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