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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23051df8bc6c9ab5255b8b6018d375f701bda546b019876e9a4f93273da31ce3' 
  AND token = '9U9klsflPp3p8tOaJdkdqw5A0HVZ4h4cdVuYQ/47+bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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