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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956002bbcb4f7c05a198d40f78c41679702713d9adc7b56c19664083166b71a2' 
  AND token = 'E4kqjN3RM9cLv8fwKwNIsJ6J9417gh+RCfx22NEENVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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