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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b5317785ebb28a580a00cb84221f71cae68c0a4d04a3b54b4ec977ab8307eb' 
  AND token = 'KQf84nf8WCc68lWCq5DLYo0EU8o193d7y4+XKoGXrzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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