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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bafbe8df7bfe2b2157da97c2a8fc5e72bcb4ee16a31438c5e6505c62b5e0fc' 
  AND token = 'hYi/EGRG98FerF+A9Q9siDtCR/YhMLSFb9xtE9ngtA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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