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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ec225a335e784db53b81e7e705357f6d76a35b501aacead1dfa6f19e81743b' 
  AND token = '3lZSwhYy2kKLVKLPQEOL/ZoN1Aajhn8dumOHriEj7bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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