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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8362a120f7249467d6f6ef72b82ea9f326e303d14636368bf1463d9e01ff38ea' 
  AND token = 'QmKKaTo+gZEVsCsOA53++YmEHzYTCsRHbJL6MCCo22Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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