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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7039fc9bf5e5dd298b11cc09a0395b58c822e9d8fa6bd8f7f1008cb53282342d' 
  AND token = 'O+I7Ys8D6WSwd4MV20/j6VNnckUc2iMqfqrSO43jlao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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