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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23d4da8db22fa34ecd464bd281c50ed5843246748dc5e22da4f6a2a39cc39dd' 
  AND token = 'QFNSob41VbPcRqL8CJi8RbuPA04eg+62LWJLV2SbT2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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