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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae92bd44e4db0c7c05f61920d8377b09d44c3635d3ac716e03fa9b7dfbe153f' 
  AND token = 'r+lkMgvA0rhQCP6afvFr5Qdjvo3+3DKSZXdz4JgdwA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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