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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1035dfc4e1ed07cc0cddd050fa44c880ca1e66060dcb4a0ef01cf768bcc392b3' 
  AND token = '2m2x6ZSQxUCXvFffZVX81Y5MYUVzz50I3yxWJThLF6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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