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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bbd55bc2dce203e4af13e1307d43190c5e0eec049f84b2ffec13e525177bdc' 
  AND token = 'Y9kzH4WwTGdCCc6Wk14r+QDU8lhHpkbyDrC5vktK1Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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