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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30848890a378a7017f4867eaaa8578b69090f156daf3eadbe1761b8fe5a8f0a' 
  AND token = 'cvucAOx1J+SRYl7IjOYNtEaQjVEVbeL5vA/EIkQdGqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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