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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797992e0416f2a6169688619e93cb4ca9fa98135873ed8af7ec6961c1dfd32bb' 
  AND token = '516uCTFYztQ0SyPjfp9DY0YdrTDmq0jn3sGDqATTbes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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