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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25087c0d52ccaf24c2965ecbb6c604e15843a417084451f580a2bf9d7df4e69' 
  AND token = '9K5DYtdmt6XzF/pc6HsU+6Mq40LB3DrSwrfZwcFc4uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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