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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00a1e5a10c2dbff861d80b0d4ae1ca89de08f4e9a6d50596d7b2e0129a654bb' 
  AND token = '8FpWhDvsdDVG4ZFz5fxtRMM5ZrVAPlCbeJbu40CVt1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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