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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d32d0458ac3a4de4d6f718fdd4ee838aad41934b158aac0252554285e1dc89e' 
  AND token = 'q4UBHk33RRWJPgfQGCJdc8Edu+NeksGw/ZhOVD47sYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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