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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124a5e35cb4ee1f513a21ec5a6f84411ff7ad6f3e50b2cbc81772dd3bc6405b9' 
  AND token = '/Qz4t5jrrk7i73UpNqvMBPC8bqiSgd9K3W8qjrwgdhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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