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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe99d2ff01b42e1dd20c0203e30b0eda1169a0d1b2e1d44dfb3efd8a6820b063' 
  AND token = 'aI+oBHAVInqTIM5AqpVywF0JkvizoY7bBeMZtEvJPxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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