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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0678d319d0fd8928a388490bacbeeb79a0e2887a336ca41af40f54ce11113902' 
  AND token = 'uBCekfBU4uPU+ZNn+/fybaO8ZZSDqByzrOBKQmkb2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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