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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a0274a0d35e61c9bde873b599019b86e75d9087cd7ad0005233be7440ddbba' 
  AND token = 'akBtTpDe3FGr/AoegkEpipjstnb+pRw/Z8vF3/XlJsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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