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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8173520aca8d27961a4e6ba1332fbce880b7ad7787538e2889b2ba9f78637be2' 
  AND token = 'KXQWk/wyc8UZ84UuBQIIdJjoSGN9TS/fP3w53HE0txQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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