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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6302b350ff8eba7a645cb846a13f46093bbb885b60df05e852ee366830478ac1' 
  AND token = 'bk8zniF9OPB9hRNGDeESJtr4Lu3fff3KeY1OBED/BH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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