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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd957faaf35ca30208d4046f9acd704c13e747ff89e2fc3b8ec53acf4d20028c5' 
  AND token = 'AMTg79fgqQiQc0lGMSqlcx5QhwNiBHX6W5iFpHLe4rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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