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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd606c9d965f9bb4a415fbd8c14bda10412cb3789fc8c9309b98ede0224a70e7c' 
  AND token = 'qVW3xeBF7eWaymNFsXimDj1Vm3/o7BmjiyC8IxEqEgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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