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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9bae503c56c84fa54597a4a0368a55dba82737a61b24dc9bb6a57dd4307d9c' 
  AND token = '0w3q0sgQU/VKELMbZnGpeUc67UiNDQhw6kDAFyfartI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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