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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcf45b6e22ccb60dd58276e7bd88bc28704a5984d49b312f59e8283a21f19dd' 
  AND token = 'AEsc57G52uGMGYyefADM5QwmUmdccPxHYlx7P57Yhn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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