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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2b9602e88a4fa16cb329efa274eb265a68ed47e7abc7364729462820264a3b' 
  AND token = 'qjwLIMApitt3SqPf9AFCmAOVCpfM3QcPhVspxzkummo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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