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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1188ee9d2694d59e72c35c236483dc110a45b677394d2f0ac0d29a12ba6e74ad' 
  AND token = 'Q1jTQ/nKUkvwcVbcWRGl6kAt6jfn4Xpf4wGRBQi2i8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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