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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586e68d58fd9b1e1d842dbdfe4d7c2be16072adb7bf01ef8e8c1c88d6bd44220' 
  AND token = '5KT4MV/AafKTbFTzItLhocD/Hy9ra0O7zMSV9m6uHmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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