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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241a2bad076083a1819d401abebcaff4b259a422afd7b1d6f9383a6d6336089c' 
  AND token = 't9SWR17eLmoG7aKlBIsPA6RiuYZ6A1WgD6Lahhfhs7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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