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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02f6574a75fb3486abbe7afe6244284fedc93bb2dbc278f2341ce6577260631' 
  AND token = 'jrmrMCSxxHZdxed/QWxh+eCn4JVwKJbZnoEWtueBlTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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