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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b070f9e194d2520022ee6f98997a799541e79267fcfb9fa3888a90ea0a6b2a2' 
  AND token = 'qGjgF9xLG6ZpGRqEZtId+o/23L7MND8QPJUw2JTbanc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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