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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff92d0376e6378f703c5c2b55a52c0434c00cb4ecaaf4bfa732f5690481d2cc' 
  AND token = '7hi8kYCpJjHcwmEAGtzA24f6MZqoZhJ9NrW/7uAQXEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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