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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab8781aa9911550029428ddec65bf6bd1205c9c141ef7f91803e747506ac779' 
  AND token = '+6fqptg/vQ603t3mCMuUGPo47mfb3Kf21B4g1BDq9Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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