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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd455ae97ed7e3c8c18db7a70b829db858ca45d86028b016af288e715f51a9d45' 
  AND token = 'yjVyP/VvFNtDEnI7MTUFCef3w+6Sjm+EIjO/TI8ztI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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