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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9f38edb802d7b95e0959596de24ae2015a61ffb9c8e07a459779f0f8a44d1f' 
  AND token = '/jWZf6c+ZN8er7QOHlvcT7E9qbY8xJHOBVPP00r/1rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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