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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1119ec11af65770dd14ef1b3cb591cfc91ec73eae27eb9198fdabd020e24b1c4' 
  AND token = 'xZTiTGk4sm4qoe6XErLS2W2vOEGbkU7xGGr5WcwTNUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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