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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f02c93fc39d68f362b7db6a70ffb4a2ed7f9ecb34a8b39962a00e9a22e7b5eb' 
  AND token = 'NUofxxKgeUuGMzlezjVN9NEwmGcvdrbiEw5LmT7n4tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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