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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706736e2d6de48d110572f838623cb47436036f67408e8158b96c3226a81b542' 
  AND token = 'Y1iYkJlRT04wam24PWO6Grj+c0Jxj8sbquIZA7HY9b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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