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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c4a0cef2677b74db25e6f6d38d973e0e3a39cf50792c16e048b30a49164734' 
  AND token = '/K1bMKrkfqug3OkY4UjxcNQ3W61VBFw3P8PFiIU5AeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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