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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a92e48da9575fa5c1834a573eeb7a116c02f0be85cf803ec72d73bc4da8aaf' 
  AND token = 'hXYuLr9jMj+5MpjL7jowEYuen2Bn1s4HZmoov7a23cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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