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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1938bf7581c3f812c17954d0b9ec15caf69763b9b4924ed4b45a6263793957a4' 
  AND token = 'PrrCCLMHxZMsg2T+dQo9RDzOgB1a/xU+DfdNSDxQWWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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