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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c05f6eb7baacbaaec027d3ee3f54d181383d06da75ffbd1965ad2d041e804a8' 
  AND token = '2lA8Ms9ITLLAXzNBy0348RGknaAUJHYRj+ch6JOS+Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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