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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85fc6a1da49f04e89f53c1ff511e8c37b23fd28581fe274eb027721fac651fa' 
  AND token = 'LGzkEtK58i8jBs9wdc/55AmDu789F/dYXiySY4I3L+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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