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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835a48c251adca739b27d84d4950dd4e09d43852cda73a23978ccb59f1e01c3d' 
  AND token = 'XCBbpKJlIQYYsjxfT1kYBgh7/0aN8d9Sd9fTT+EPNLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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