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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55d65fc4df203408c107dd07c68206c996c36fc6402bc66a5a1093f9c799589' 
  AND token = 'hWHL0xp3DFZZWM/esaVRCFO9sw8ZZsgPhhsDadYLu6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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