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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa212ab35c29f626058876c28d4d77b1b87a8acc0bf8f97141279ff292297263' 
  AND token = '2Iw3pCLFQoyJ/Yuo2/M2+EJ7BhoN/QXKYAxcSR2Lmk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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