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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3d432dcbb6c3bab42dae0482386cc8a24d7ac0b2cb63c70016eca076300ab2' 
  AND token = '2KwZUOkQbo6b/mliRC+lbSD3N9tVJrNpXa8skbVMoIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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