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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a94559d621c46528fc4de684ddf7b20a5ab5cd6ac3e6ee76cb2f575f952017a' 
  AND token = 'lw5h8N9TTkRWiKXVpRJBpP11Ij88BzibjWLj5sNh32M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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