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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff17bca813126ad000e377f15cd5fa19d9fad974be9357f8054015133f7ea83' 
  AND token = 'N8ALLYMS8Crh9jL1aE7uElT2Iq0X6+JTFyoDaAlqT7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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