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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009a3db56dd820435f8d4da923bf6e0ef7547fc06a9c9ac0b6ecf5f4c8bc539a' 
  AND token = 'chv0h9ZfA7/bFl9Xe78paaWoM+loS//AFELDAILMlvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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