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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bba55146c9c00e2db843a512b0a5a2a6bab4fd7a98e96bb6df1d918dbb92ade' 
  AND token = '/qsY9aucZTrPnPRXDb0XwkgSDkvAeF107fOzYMmHrzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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