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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad196f31332d8437cc33c35c5943e5a95af4cb4c21ac14b9fc34b37d2e6ae490' 
  AND token = 'ZASG8T/b+rWaAfn769w1jdodXaPFJ5kVeTXpKukp1QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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